redirect loop fixed; WP 3.8 check

git-svn-id: https://plugins.svn.wordpress.org/groups-404-redirect/trunk@822720 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagged 1.1.3

git-svn-id: https://plugins.svn.wordpress.org/groups-404-redirect/trunk@822723 b8457f37-d9ea-0310-8a92-e5e31aec5664